diff --git a/04week/loop.js b/04week/loop.js
index e69de29bb..9c3fdf907 100644
--- a/04week/loop.js
+++ b/04week/loop.js
@@ -0,0 +1,78 @@
+'use strict';
+
+const cars = ["honda","ford","fonda","hoard","horse"];
+
+const carsInReverse = (arr1) => {
+    arr1.reverse().forEach(car => {
+        console.log(car)
+    });
+}
+
+carsInReverse(cars);
+
+cars.forEach(car => {
+    console.log(car)
+});
+
+const persons = {
+    firstName: "Jane",
+    lastName: "Doe",
+    birthDate: "Jan 5, 1925",
+    gender: "female",
+}
+
+const printPersonalDataKeys = (obj1) => {
+    for (const personalData in obj1){
+        console.log(personalData);
+    }
+}
+
+printPersonalDataKeys(persons);
+
+const printPersonBirthday = (obj1) => {
+    for (const personalData in obj1){
+        if(personalData=="birthDate") return console.log(obj1[personalData]);
+    }
+}
+
+printPersonBirthday(persons);
+
+const countForLoop = ()=>{
+    for(let i = 1; i<1001;i++){
+        console.log(i)
+    }
+}
+
+const countWhileLoop = () => {
+    let counter = 1;
+    while(counter<1001){
+        console.log(counter);
+        counter++;
+    }
+}
+
+const countDoWhileLoop = () => {
+    let counter = 1;
+    do {
+        console.log(counter);
+        counter++;
+    } while (counter<1001)
+}
+
+// When is a for loop better than a while loop?
+// for loops are good for a known number of iterations for loops are generally better 
+
+// How is the readability of the code affected?
+// 
+
+// What is the difference between a for loop and a for...in loop?
+// A for loop is a general case counting loops where as for in is a loop specifically for objects
+
+
+// What is the difference between a while loop and a do...while loop?
+// a while loop runs as long as a condution is true, a while loop will run at least once, and while the condition is true
+
+
+countForLoop();
+countWhileLoop();
+countDoWhileLoop();
\ No newline at end of file